Grinding and polishing machine.



* W. S. THOMSON.

GRINDING AND POLISHING MACHINE. APPLICATION HLED APR. 26. um.

Patented Feb. 26, 1918.

2 SHEETS-SHEET 1.

W. S. THOMSON.

GRINDING AND POLISHING MACHINE. AEPLICATION FILED APR-26. 1911.

LNIWIMNI Patented Feb, 26,1918.

2 SHEETPSHEET 2.

III III A NI I i "U'NJITEU snares earner orrren.

WILLIAM S. THOMSON, OF PLANTSVILLE, CONNECTICUT, AfiSIGNOR TO THE H. 1).SMITH & COMPANY, OF PLANTSVILLE, CONNECTICUT, A CURPORATION.

GRINDING AND POLISHING MACHINE.

1,25? field.

Application filed April 26, 1917.

To all whom it may concern:

Be it known that I, WILLIAM "STRATTON THOMSON, a citizen of the UnitedStates, residing at Plantsvilile, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inGrinding and Polishing Machines, of which the following isaspecification.-

My invention relates to improvements in grinding and polishing machines,and the object of my improvement is simplicity-and economy inconstruction and convenience bearing heads being shown in sideelevation.

Fig. 4 is a se'ctiona-l view on the line g 2y of Fig. 3.

Fig. 5 is a sectional view, corresponding to Fig. 3, of a modified formof structure.

My improved grinding and polishing inachinecomprises a casing 10 inwhich is operatively housed a shaft 11 which projects outwardlytherefrom and on the outer end of which is mounted a grinding orpolishing wheel 12, and the operation of which'is controlled by a handle13. The casing 10 is a shell-like structure and comprises a body portioncomposed of the pedestal portion 14L having tapered front and rear wallsand merging into the base 15 at the lower end and at'the upper endmerging into the boxlike head 16, and the upper end is closed by a cover17 which may be secured by bolts '18. The shaft 11 is mounted. in ballbearings 19 provided in a pair of journal heads 20 positioned in thecasing head 16. The

driven pulley 21 is shrunk on the shaft 11 between the journal heads .20and the belt 22 rests on the upper face thereofand drops downwardly tothe driving pulley on a counter shaft directly below the same. The shaft11 projects through a vertical slot 23 inithe end wall of the casinghead16 and Specification of Letters Patent.

.the bridge 24- between the two Patented Feb. 26, 191%.

Serial No. 184,601.

is provided with means for being raised and lowered to be described.

Below the pulley 21 the casing 10 is provided with a bridge 24E, castintegral therewith and comprismg cross-members 25, one on each side ofthe pulley 21, and a platel1ke member 26 at the middle and supported bythe said cross-members 25. The said plate-like member 26 is just belowthe pulley 21 and serves as a brake plate and may be provided with acushioning member in the form of a piece of leather 27 for engagingdirectly with the pulley and braking the same when the pulley is loweredthereon.

The shaft 11 as stated is operatively sup ported by bearings 19 providedin the journal heads 20. The journal heads 20 comprise a head proper 28provided with an axial bore 29 in which is positionedthe shaft 11 andvertical ways 30 at the front and rear, suitable to slidably engage withguide ways 31 secured to the casing head 16 by screws 32 and 33, andhaving a neck or stem 34 extending downwardly from the said head proper28. The neck 34 of each of the bearing heads 20 fits into a hole 35provided in the upwardly directed branch .36 or a generally Ushapedcross-member 87, and is held in place by a set screw 38.

The body portion or middle portion 39 of the cross-member 3'? extendsacross below journal heads .20.

The cross-member 37 is adjustably supported adjacent each end of thebody portion 39 by means of a stud 10 which connects with a yoke ll. Theyokes 41 are supported from an auxiliary shaft a2, and the said shaft 42is supported eccentrically in the end disks as, rotatively housed inbosses at in the side walls of the casing.

The studs 10 have left handed threads on one end and right hand threadson the other end, the upper end being screwed into a threaded hole 45 inthe cross-member 37 and the lower end is secured in the threaded hole 46in the upper end of the yoke 11. The yoke a1 is provided in the lowerportion with a slot 47 which extends transversely'relatively to thevertical axial plane of the shaft 11 and supporting stud 40, and which'is a lit for and in which is operatively positioned the auxiliary shaftor rod 42. The two yokes 41 are in horizontal alinement and theauxiliary shaft 42 ex tends therethrough, the end portions thereof beingsecured in the disks 43.

As the disks or eccentrics 43 are rotated the auxiliary shaft 42 ismoved therewith in an arc and the same is accordingly raised and loweredas well as swung back and forth relatively to the vertical axial plane.The slot 47 permits of the cross-wise movement of the auxiliary shaft 42while the yoke 41, stud 40, and journal head 20 are maintainedconstantly in the same axial and vertical plane, and the ways 30 and 31permit of vertical movement of these parts responsive to raising andlowering of the auxiliary shaft 42.

The auxiliary shaft 42 extends outwardly through the disk 43 at onesideand has the handle 13 mounted thereon, and a stop pin 48 is provided onthe casing 10 for limiting the movement of the handle 13 in one direction, the movements of the handle 13- back and forth serving to raiseand lower the shaft 11.

The ways 31 comprise strips of material of uniform cross-section andsuitable'length positioned in the casing head 16 and adjacent andparallel with the front and back walls 61 thereof. These have a Vformation on the inner face 62 and are flat along the outer face 63, andhave a screw threaded hole 64 at about the middle of the rear face 63suitable for receiving the supporting screw 32. These screws 32 passthrough holes 67 in the outer wall 61 and the heads 65 engage with thecounter faces of the said'outer wall 61, preferably in a counter boredseat 66 provided therefor.

The screws 33 are headlessand are engaged with screw threaded holes 68in the walls 61 and engage with their inner ends against the outer face63 of the track or Way 31, and serve as backing screws in opposition tothe middle supporting screws 32, there being two of the backing screws33, one above and one below the supporting screw 32 in each case.

As described, the tracks or ways 31 are substantially parallel with thewalls 61 and they are in spaced relation thereto, being spaced therefromby a small space 69 sufticient with the limited freedom of movementpermitted by the screw supporting means provided to permit of a slightadjustment of the said tracks to provide for properly guiding thejournal heads 20 in their move- 'ment substantially in a vertical plane.

The journal or bearing head 20 has an axial bore 50 at the middleportion that receives a reduced portion 51 of the shaft 11, and the endportions 52 are enlarged suitably to receive the parts that compose theball bearings proper, composed of the inner cones 53, and outer cones54, and the balls 55. Thus the bearing structure of the journal heads 20is in each case duplex, having two bearings proper, in spaced relation,

.and any such adjustment does not affect the alinement of the bearings.

That is to say, turning one of the studs 40 one way or the other toraise or lower one end of the shaft has no effect whatsoever on therelative alinement of the shaft and the bearings, such as wouldbe thecase were no such cross-member provided.

Also, the structure described serves to relieve the tracks and thesupporting screws therefor of side strain in the engagement with thejournal heads.

In the modified form of structure the journal heads 20 and thecross-members 37 are all parts of a unitary carriage structure 56 0fU-shape generally, the other structural features being substantially ashave already been described.

I claim as my invention:

1. In a grinding and polishing machine, a casing having a casing head atthe upper end, a pair of journal heads slidably mounted in the saidcasing head and having bearings for a shaft, a cross-member rigidlyconnecting the said journal heads, and hand operated means for raisingand lowering the said cross-member and journal heads as a unit.

2. In a grinding and polishing machine, a casing, a shaft for a grindingwheel housed in the said casing and supporting a driving pulley, a pairof journal heads, one on each side of the said pulley, bearings in thesaid heads engaged with the said shaft, a bridgebrake positioned belowthe said pulley, a cross-member rigidly inter-connecting the saidjournal heads and extending across be tween the said heads below thesaid bridgebrake and hand operated means for raising and lowering thesaid cross-member and heads.

3. In a grinding and polishing machine, a casing, a shaft for a grindingWheel housed in the said casing and supporting a driving pulley, a pairof journal heads, one on each side of the said pulley, bearings on thesaid heads engaged with the said shaft, a bridgebrake positioned belowthe said pulley, a cross-member rigidly inter-connecting the saidjournal heads and extending across between the said heads below the saidbridgebrake, hand operated means for raising and lowering the saidcross-member and heads,

and adjustable means serving to connect the 130 said cross-member withthe said hand 0perated means.

i. In a grinding and polishing machine, a pair of bearing structures forsupporting a shaft, and positioned in spaced relation suitably toreceive the driving pulley therebetween, a bridge-brake positionedbetween the said bearing structures, below the pulley receiving space,shifting means for shifting the said bearing structures so as to movethe pulley toward and away from the said bridge-brake, connecting meansfor connecting the said bearing structures and shifting means andoperative to permit of adjustment and a cross-member for interconnectingthe said bearing structures serving to maintain the alinement thereofindependently of the said connecting means.

WILLIAM S. THOMSON. Witnesses:

Gno. R. BOND; EDWARD H. CURTIS.

fiopies of this patent may he obtained for five cents each, byaddressing the Commissioner of Patents,

Washington, D. (3.

